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Earth and space

March of the moons

Three of Jupiter's largest moons move across its face.
The image on the left shows the Hubble observation at the beginning of the event. On the left is the moon Callisto and on the right, Io. The shadows from Europa, which cannot [...]

First solar flare of 2015

An medium-size solar flare erupts from the right side of the sun in this image in the early morning of 13 January, 2015 (British time). The image was recorded using two wavelengths (171 and 304 angstroms) of light too energetic for our eyes to see, as captured by NASA's Solar Dynamics Observatory. Credit: NASA/Solar Dynamics Observatory
The sun emitted its first notable solar flare, peaking in the early morning of 13 January, 2015. Solar flares are powerful bursts of radiation – a sort of non-visible [...]

Superstar Eta Carinae

Eta Carinae's great eruption in the 1840s created the billowing Homunculus Nebula, imaged here by Hubble. Now about a light-year long, the expanding cloud contains enough material to make at least 10 copies of our sun. Astronomers cannot yet explain what caused this eruption. Image Credit: NASA, ESA, and the Hubble SM4 ERO Team
Eta Carinae is the most luminous and massive stellar system within 10,000 light-years of Earth (the distance light travels in 10,000 years). It is known for its surprising [...]

Sunspots

A mid-level solar flare erupted on the sun on 18 December 2014. It can be seen in this image from NASA's Solar Dynamics Observatory (SDO) as the bright spot near the center of the sun. SDO observes light in extreme ultraviolet wavelengths that can highlight the intense heat present in a solar flare. Credit: NASA/SDO
Bursts of magnetic activity on the sun make sunspots, which can be seen with special [...]

NASA photographs Saturn

Saturn_NASA_Cassini_PIA11141
Image: IPL/JPL.NASA NASA sent a small spaceship out into space to photograph Saturn.  Here is an image it sent back. Isn’t it [...]

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